Timber perforating machine



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SHINNOSUKE WATANABE 3,088,503

May 7, 1963 TIMBER PERFORATING MACHINE 2 Sheets-Sheet 1 Filed March 8,1961 IIIEHIII'IIIIIIIIIEII INVENTOR. SH/1V [v0 fill/(E WA TA NABE A TTOEVEKS y 1963 SHINNOSUKE WATANABE 3,088,503

TIMBER PERFORATING MACHINE Filed March 8, 1961 2 Sheets-Sheet 2 IIIHINVENTOR. SH/N/VOSUKE wATAA/ABE A ORNEYS United States Patent C M3,088,503 TIMBER PERFORATING MACHINE Shinnosuke Watanabe, Sakyoku,Kyoto, Japan, assignor to Toyoko Takagi, Kyoto, Japan Filed Mar. 8,1961, Ser. No. 94,384 3 Claims. (Cl. 144-72) The present inventionrelates to timber perforating machines, and more particularly, suchmachines that can make rectangular holes in timber mechanically, and hasfor its object to obtain a timber perforating machine comprising a pairof vertical supports located in space, each of which has a receivingopening for setting a timber, each upper portion of said supports beingin a telescopic arrangement under influence of a restoring spring, amovable main body secured to both said upper portions, carrying anendless cutting chain, which consists of chisel links and saw linksarranged alternately and is located between said supports, engaging witha driving chain wheel and guide chain wheels, and an operating handlefor moving the main body together with the cutting chain towards thetimber against the restoring springs.

Hitherto the production of rectangular holes in timber has been chieflycarried out in manual manners, namely by using chisels, andconsequently, it has been very ineflicient. According to my inventionrectangular holes can be easily and productively made in timber by onlypressing the operating handle downwards, and moreover, those of varioussizes can be made by adjusting the shape of the endless cutting chain.

The specific objects and advantages will become apparent from aconsideration of the following description.

In the accompanying drawings:

FIG. 1 is an elevational view of a timber perforating machine accordingto my invention;

FIG. 2 is a plan view of the machine;

FIG. 3 is a sectional side view of the machine taken along the line AAin FIG. 1;

FIG. 4 is a sectional side view of the machine taken along the line B-Bof FIG. 1;

FIG. 5 is a sectioned elevational view of an endless cutting chain partof the machine, one half being shown;

FIG. 6 is a partly sectioned side view of said part;

FIG. 7 is a sectional plan view of said part taken along the line CC inFIG. 5;

FIG. 8 is a plan view of a chisel link;

FIG. 9 is a sectioned elevational view of said chisel link taken alongthe line D--D in FIG. 8;

FIG. 10 is a plan view of a saw link; and

FIG. 11 is an elevational view of said saw link.

Like characters of reference indicate corresponding parts throughout theviews.

Referring to FIGS. 1-4, 1 denotes a machine frame having a pair ofvertical supports 2 located in a suitable space, each middle portion ofwhich is formed to be a rectangular side opening 3 for receiving atimber and is provided with a screw 4 for setting said timber. Firmlyinserted in each vertical cylindrical portion 5 of the supports 2 is ahollow supporting tube 6 engaging with a supporting rod 7 telescopicallyunder influence of a restoring spring 8. Each top end of said supportingrods is secured to each horizontal arm 9 of a main body 10 which is thusmovable in a vertical direction.

The main body 10 has a vertical slot 11 at its upper portion, throughwhich slot a horizontal driving shaft 12 is adjustably secured to saidmain body. Rigidly fixed to the front end and the rear end of saiddriving shaft are a driving chain wheel 13 and a driving pulley 14,respectively.

Provided with the lower portion of the main body 10 are a pair ofhorizontal bars 15, each of them having 'a Patented May 7, 1963horizontal slot 16, through which said bars are adjustably secured tothe main body with a fixing bolt 17. To each outer end of the bars 15-is a side guide chain wheel 18 is secured, and moreover, to the bottomend of the main body 10 a bottom .guide chain wheel 19 is secured. Anendless cutting chain 20 of quadrilateral shape is en gaged with thechain wheels 13-, 18 and 19, as more clearly shown in FIGS. 5 to 7.

The endless cutting chain 20 consists of chisel links 21 and saw links22, each of said chisel links and each pair of said saw links beingarranged alternately and con nected by a pin 23. The chisel link 21 isof U shape and has a chisel blade 24 on its top end as shown in FIGS. 8and 9. The saw link 22 is a plate and has saw teeth 25 on its top end asshown in FIGS. 10 and 11.

26 shows an operating lever handle pivoted on the top end of the frame1, the central portion of which handle is pivotally secured to the topportion of the main body 10.

The timber perforating machine according to my invention is thusconstructed, and its operation is as follows:

A timber 27, in which a rectangular hole is required, is inserted in thereceiving openings 3 and is rigidly set by the screws 4, and the drivingpulley 14 is rotated by a motor or any other driving source, then thedriving chain wheel 13, which is firmly united with the driving shaft 12together with said driving pulley, is rotated, thereby driving theendless cutting chain 20. Now the lever handle 26 is pressed downwards,then the main body 10 connected to said handle goes down together withthe cutting chain 20, compressing the restoring springs 8 and pushingthe supporting rods 7 into the supporting tubes 6 by the arms 9 of saidmain body.

When the bottom portion of the cutting chain 20 reaches the timber 27,the chisel links 21 and the saw links 22 successively and respectivelychisel and saw the timber, thereby perforating it and making arectangular hole in it.

When the operating handle .26 is released, the main body 10 as well asthe cutting chain 20 restore automatically to their original positionsunder influence of the springs 8.

If the driving chain wheel 13 is moved in an upper position by changingthe location of the driving shaft 12 along the vertical slot 11 and atthe same time each of the side chain wheels 18 together with each of thebars 15 is moved in an inner position through the horizontal slot (16,the quadrilateral cutting chain 20 will become slender, whereby ashorter rectangular hole can be obtained.

Without further description it is thought that the features andadvantages of the invention will be readily apparent to those skilled inthe art, and it will of course be understood that changes in form,proportion and minor details of construction may be resorted to, withoutdeparting from the spirit of the invention or the scope of the app-endedclaims.

What I claim is:

1. Apparatus for perforating a rectangular hole in wood or the like,comprising a frame having means for clamping a workpiece to beperforated therein, chain mounting means mounted on said frame forreciprocal vertical movement thereon toward and away from the positionin which the workpiece is clamped in the frame, an endless cutting chainmounted on said chain mounting means and having saw and chisel meansalternating along the length of said chain, the path of said chain onsaid chain mounting means having an apex at the lowermost point thereof,said chain mounting means being adjustable for changing the horizontaldimension of said chain path and altering the angle of the apex of thechain at the lowermost point of the path of the chain, and means on saidchain mounting means adapted to be connected to driving means fordriving said chain, whereby the portion of the chain running past theapex of the path of the chain will contact the workpiece in which thehole is to be formed finst and the size of the cut will be graduallyelongated as the chain mounting means is moved,

downwardly toward the workpiece.

2; Apparatus as claimed in claim 1 in which said chain mounting meanscomprises a plurality of atleast four chain Wheels thereon, said chainwheels being arranged in a pattern with afirst wheel at a lowermostpoint and two further wheels on the same level and abovethe lowermostwheel, whereby the chain running over said first wheel and said' twofurther wheelsruns in a path forming the apex.

3. Apparatus as claimed in claim 2 in which said chain mounting meansfurther comprises a mounting frame and said two further wheels areadjustably mounted for adjustment laterally of said frame, and at leastone of the wheels of the remaining wheels of the plurality of wheelsother than said first wheel and said two remaining wheels is adjustabletoward and away from said two wheels.

References Cited in the file of this patent UNITED STATES PATENTS

1. APPARATUS FOR PERFORATING A RECTANGULAR HOLE IN WOOD OR THE LIKE,COMPRISING A FRAME HAVING MEANS FOR CLAMPING A WORKPIECE TO BEPERFORATED THEREIN, CHAIN MOUNTING MEANS MOUNTED ON SAID FRAME FORRECIPROCAL VERTICAL MOVEMENT THEREON TOWARD AND AWAY FROM THE POSITIONIN WHICH THE WORKPIECE IS CLAMPED IN THE FRAME, AN ENDLESS CUTTING CHAINMOUNTED ON SAID CHAIN MOUNTING MEANS AND HAVING SAW AND CHISEL MEANSALTERNATING ALONG THE LENGTH OF SAID CHAIN, THE PATH OF SAID CHAIN ONSAID CHAIN MOUNTING MEANS HAVING AN APEX AT THE LOWERMOST POINT THEREOF,SAID CHAIN MOUNTING MEANS BEING ADJUSTABLE FOR CHANGING THE HORIZONTALDIMENSION OF SAID CHAIN PATH AND ALTERING THE ANGLE OF THE APEX OF THECHAIN AT THE LOWERMOST POINT OF THE PATH OF THE CHAIN, AND MEANS ON SAIDCHAIN MOUNTING MEANS ADAPTED TO BE CONNECTED TO DRIVING MEANS FORDRIVING SAID CHAIN, WHEREBY THE PORTION OF THE CHAIN RUNNING PAST THEAPEX OF THE PATH OF THE CHAIN WILL CONTACT THE WORKPIECE IN WHICH THEHOLE IS TO BE FORMED AND THE SIZE OF THE CUT WILL BE GRADUALLY ELONGATEDAS THE CHAIN MOUNTING MEANS IS MOVED DOWNWARDLY TOWARD THE WORKPIECE.